33531 with additions: retain status of exited background jobs.

Add linked list of unwaited-for background jobs.
Truncate at value of _SC_CHILD_MAX discarding oldest.
Remove old lastpid_status mechanism for latest exited process only.
Slightly tighten safety of permanently allocated linked lists so
that this doesn't compromise signal handling.

1 files changed, 4 insertions, 0 deletions

diff --git a/Src/linklist.c b/Src/linklist.c
index 1e364fb4e..3aa8125d9 100644
--- a/Src/linklist.c
+++ b/Src/linklist.c
@@ -118,6 +118,8 @@ znewlinklist(void)
     LinkList list;
 
     list = (LinkList) zalloc(sizeof *list);
+    if (!list)
+	return NULL;
     list->list.first = NULL;
     list->list.last = &list->node;
     list->list.flags = 0;
@@ -152,6 +154,8 @@ zinsertlinknode(LinkList list, LinkNode node, void *dat)
 
     tmp = node->next;
     node->next = new = (LinkNode) zalloc(sizeof *tmp);
+    if (!new)
+	return NULL;
     new->prev = node;
     new->dat = dat;
     new->next = tmp;